/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.transport.threadpool;

import java.nio.channels.SelectionKey;

public class ThreadPoolWorkerThread extends Thread {
  
  private boolean isAvailable = true;
  private boolean readOperation = false;
  private boolean writeOperation = false;
  private PoolTCPLink poolTCPLink;
  private SelectionKey key;
  private ThreadPoolManager threadPoolManager;

  private boolean terminate = false;

  private Object waitObject;
  private String moduleName = "ThreadPoolWorkerThread: ";


  public ThreadPoolWorkerThread(ThreadPoolManager threadPoolManager) {
    this.threadPoolManager = threadPoolManager;
    waitObject = new Object();
  }
  
  public void setLinkServiced(PoolTCPLink poolTCPLink) {
    this.poolTCPLink = poolTCPLink;
  }

  public PoolTCPLink getLinkServiced() {
    return poolTCPLink;
  }
  
  public boolean isAvailable() {
    return isAvailable;
  }

  public void performReadOperation(SelectionKey key) {
    System.out.println(moduleName + "Performing Read Operation on " +
		       poolTCPLink);
    this.key = key;
    readOperation = true;
    synchronized(waitObject) {
      isAvailable = false;
      waitObject.notify();
    }
    
  }

  public void run() {
    
    while (!terminate) {
      try {
	/** The thread has to wait to be supplied with the appropriate 
	    PoolTCPLink. Just prior to waiting we set the availability of this
	    worker thread to true */
	synchronized(waitObject) { 
	  isAvailable = true;
	  waitObject.wait(); 
	};
	
	if (terminate) {
	  break;
	}
	
	if (readOperation) {
	  poolTCPLink.getReceiver().readDataFromSocket();
	  threadPoolManager.returnToThreadPool(this);
	}
	
      } catch (Exception e) {
	key.cancel();
	System.out.println(moduleName +"Connection to " + poolTCPLink + 
			   " has been lost ...");
	poolTCPLink.processLossOfSocketConnection();
	System.out.println(moduleName + e);
	e.printStackTrace();
      } /*end try-catch */
      
    } /*end while(!terminate)*/
    
    System.out.println(moduleName + "Proceeding to terminate worker thread");
  }

  public void terminate() {
    terminate = true;
    synchronized(waitObject) {
      isAvailable = false;
      waitObject.notify();
    }
  }

}
